MTA-4662: Update containerless CLI docs

[anarnold97]

JIRA

• MTA-4662

PREVIEW

• 2.3.4. Running the containerless CLI

[anarnold97]

@eemcmullan && @ibragins - updated, please can you re-review

Thanks

[anarnold97]

@ibragins - updated, please review

[anarnold97]

@istein1 & @ibragins - updated - think this is correct

[anarnold97]

@istein1 & @ibragins - please can i give you another nudge to review

[anarnold97]

@istein1 - are you ok to merge?

[ibragins]

Instead of those For example I'd say something like
For linux:
To make mta-cli command widely available in the system, you can either move it to /usr/bin :
sudo mv ~/.kantra/mta-cli /usr/bin/
or you can add its location to the global $PATH variable
export PATH=$HOME/.kantra:$PATH

[ibragins]

LGTM now, thank you @anarnold97